Method for link quality estimation in a wireless network

• US 8,724,493 B2
• Filed: 12/18/2009
• Issued: 05/13/2014
• Est. Priority Date: 12/19/2008
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Europe Ltd (NEC Corporation)
• Inventors: Schoeller, Marcus, Imai, Pierre, Schmid, Stefan
• Primary Examiner(s): PHAN, MAN U
• Application Number:
  US13/140,867
• Publication Number:
  US 20110310755A1
• Time in Patent Office: 1,607 Days
• Field of Search: 370238-468, 455343-522, 709220-224
• US Class Current: 370/252
• CPC Class Codes: H04L 43/0829 Packet loss
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

A method for link quality estimation in a wireless network, is characterized in that nodes of the wireless network perform the steps of sending packets to other nodes, monitoring all packets received from other nodes being located within their communication range, and calculating sent-received ratios with respect to other nodes and deriving thereof a link quality towards the respective nodes.

Claims

1. Method for link quality estimation in a wireless network, comprising nodes of said wireless network performing the following:

sending packets to other nodes,

monitoring all packets including data, signaling, and management packets received from other nodes located within a communication range, whether or not the nodes are the intended recipients,

calculating sent-received ratios with respect to other nodes and deriving thereof a link quality towards the respective nodes, and

defining monitoring intervals and instructing other nodes located within the communication range of the defined monitoring intervals,

wherein nodes receiving packets create individual receipt reports for sending nodes, said receipt reports including information about packets received from a respective sending node within the defined monitoring interval,

wherein sent packets contain a packet reference, in particular a sequence number, and

wherein the receipt report includes a packet loss ratio derived by a respective receiving node.

2. The method according to claim 1, wherein said instruction is achieved by explicit signaling from node to other nodes located within the communication range.

3. The method according to claim 1, wherein new monitoring intervals are started with each request for connection establishment.

4. The method according to claim 1, wherein monitoring intervals are defined as fixed time quanta starting at a pre-defined point in time.

5. The method according to claim 1, wherein the receipt report includes a packet counter of packets sent from the respective node per monitoring interval.

6. The method according to claim 1, wherein the receipt report includes a packet reference indicating the beginning of monitoring intervals.

7. The method according to claim 1, further comprising periodically receiving receipt reports from a respective node.

8. The method according to claim 1, further comprising recording information about sent packets.

9. The method according to claim 8, wherein the recorded information about sent packets includes information items concerning the number of sent packets per monitoring interval.

10. The method according to claim 8, wherein the recorded information about sent packets includes the packet sequence numbers.

11. The method according to claim 1, comprising considering which communication protocol is being used to derive link quality.

12. The method according to claim 1, further comprising determining a stability value for the calculated link quality.

13. The method according to claim 12, wherein the stability value is gradually adapted based on last determined values.

14. The method according to claim 2, wherein new monitoring intervals are started with each request for connection establishment.

15. The method according to claim 5, wherein the receipt report includes a packet reference indicating the beginning of said monitoring intervals.

16. The method according to claim 9, wherein the recorded information about sent packets includes the packet sequence numbers.